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Thanks Alex.
Keypad wired with resistors is unconventional. But it have certain problems as told by the author itself. When multiple keys are pressed at the same time, the Voltage values will be unpredictable. I2C port expander is a better solution.
Can anybody suggest an I2C based keypad interface IC, like texas instruments TCA8418.
It must have a keypad encoder and give character outputs through i2c
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